<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="./css/inputnumber.css" />
    <link rel="stylesheet" href="./css/index.css" />
    <title>购物车</title>
  </head>
  <body>
    <div class="app-container" id="app">
      <!-- 顶部banner -->
      <div class="banner-box">
        <img src="http://autumnfish.cn/static/fruit.jpg" alt="" />
      </div>
      <!-- 面包屑 -->
      <div class="breadcrumb">
        <span>🏠</span>
        /
        <span>购物车</span>
      </div>
      <!-- 购物车主体 -->
      <div class="main" v-if="fruitList.length>0">
        <div class="table">
          <!-- 头部 -->
          <div class="thead">
            <div class="tr">
              <div class="th">选中</div>
              <div class="th th-pic">图片</div>
              <div class="th">单价</div>
              <div class="th num-th">个数</div>
              <div class="th">小计</div>
              <div class="th">操作</div>
            </div>
          </div>
          <!-- 身体 -->
          <div class="tbody">
            <div
              v-for="v of fruitList"
              :key="v.id"
              class="tr"
              :class="{active:v.isChecked}"
            >
              <div class="td">
                <input type="checkbox" v-model="v.isChecked" />
              </div>
              <div class="td"><img :src="v.icon" alt="" /></div>
              <div class="td">{{ v.price }}</div>
              <div class="td">
                <div class="my-input-number">
                  <button class="decrease":disabled="v.num<=1" @click="changeNum(v.id,v.num-1)">-</button>
                  <span class="my-input__inner">{{ v.num }}</span>
                  <button class="increase"  @click="changeNum(v.id,v.num+1)">+</button>
                </div>
              </div>
              <div class="td">{{ v.price*v.num }}</div>
              <div class="td"><button @click="del(v.id)">删除</button></div>
            </div>           
          </div>
        </div>
        <!-- 底部 -->
        <div class="bottom">
          <!-- 全选 -->
          <label class="check-all">
            <input v-model="isAll" type="checkbox" />
            全选
          </label>
          <div class="right-box">
            <!-- 所有商品总价 -->
            <span class="price-box"
              >总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price"
                >{{ checkedfruitListmoney }}</span
              ></span
            >
            <!-- 结算按钮 -->
            <button class="pay">结算( {{ checkedfruitListcount }})</button>
          </div>
        </div>
      </div>
      <!-- 空车 -->
      <div v-else class="empty">🛒空空如也</div>
    </div>
    <script src="../vue.js"></script>
    <script>
      const app = new Vue({
        el: "#app",
        data: {
          fruitList:JSON.parse(localStorage.getItem('fruitList'))||[],
          // 水果列表
          // fruitList: [
          //   {
          //     id: 1,
          //     icon: "http://autumnfish.cn/static/火龙果.png",
          //     isChecked: true,
          //     num: 2,
          //     price: 6,
          //   },
          //   {
          //     id: 2,
          //     icon: "http://autumnfish.cn/static/荔枝.png",
          //     isChecked: false,
          //     num: 7,
          //     price: 20,
          //   },
          //   {
          //     id: 3,
          //     icon: "http://autumnfish.cn/static/榴莲.png",
          //     isChecked: false,
          //     num: 3,
          //     price: 40,
          //   },
          //   {
          //     id: 4,
          //     icon: "http://autumnfish.cn/static/鸭梨.png",
          //     isChecked: true,
          //     num: 10,
          //     price: 3,
          //   },
          //   {
          //     id: 5,
          //     icon: "http://autumnfish.cn/static/樱桃.png",
          //     isChecked: false,
          //     num: 20,
          //     price: 34,
          //   },
          // ],
        },
        computed:{
      isAll:{
        get(){
      return this.fruitList.every(v=>v.isChecked)
        },
        set(newValue){
      return this.fruitList.forEach(v => v.isChecked=newValue);
        }
      },
      // 选中的水果列表
      checkedfruitList(){
  return this.fruitList.filter(v=>v.isChecked)
      },
      // 选中的水果总价
      checkedfruitListmoney(){
    return this.checkedfruitList.reduce((sum,v)=>sum+v.price*v.num,0)
      },
      // 选中的水果总数量
      checkedfruitListcount(){
    return this.checkedfruitList.reduce((sum,v)=>sum+v.num,0)
      },
        },
        watch:{
       fruitList:{
        deep:true, //开启深度监听
        handler(){
          // 本地存储，只能存字符串，如果是对象或数组，要用JSON.stringify序列化成字符串，再存入
          localStorage.setItem('fruitList',JSON.stringify(this.fruitList))
        }
       }
        },
        methods: {
          changeNum(id, num) {
            const fruit = this.fruitList.find((v) => v.id === id);
            fruit.num = num;
          },
          //删除功能
          del(id) {
            this.fruitList = this.fruitList.filter((v) => v.id !== id);
          },
        },
              });
    </script>
  </body>
</html>
